int
Permedia3MemorySizeDetect(ScrnInfoPtr pScrn)
{
GLINTPtr pGlint = GLINTPTR (pScrn);
CARD32 size = 0, temp, temp1, temp2, i;
/* We can map 64MB, as that's the size of the Permedia3 aperture
* regardless of memory configuration */
pGlint->FbMapSize = 64*1024*1024;
#ifndef XSERVER_LIBPCIACCESS
/* Mark as VIDMEM_MMIO to avoid write-combining while detecting memory */
pGlint->FbBase = xf86MapPciMem(pScrn->scrnIndex, VIDMEM_MMIO,
pGlint->PciTag, pGlint->FbAddress, pGlint->FbMapSize);
#else
{
void** result = (void**)&pGlint->FbBase;
int err = pci_device_map_range(pGlint->PciInfo,
pGlint->FbAddress,
pGlint->FbMapSize,
PCI_DEV_MAP_FLAG_WRITABLE,
result);
if (err)
return FALSE;
}
#endif
if (pGlint->FbBase == NULL)
return 0;
temp = GLINT_READ_REG(PM3MemBypassWriteMask);
GLINT_SLOW_WRITE_REG(0xffffffff, PM3MemBypassWriteMask);
/* The Permedia3 splits up memory, and even replicates it. Grrr.
* So that each 32MB appears at offset 0, and offset 32, unless
* there's really 64MB attached to the chip.
* So, 16MB appears at offset 0, nothing between 16-32, then it re-appears
* at offset 32.
* This below is to detect the cases of memory combinations
*/
/* Test first 32MB */
for(i=0;i<32;i++) {
/* write test pattern */
MMIO_OUT32(pGlint->FbBase, i*1024*1024, i*0x00345678);
mem_barrier();
temp1 = MMIO_IN32(pGlint->FbBase, i*1024*1024);
/* Let's check for wrapover, write will fail at 16MB boundary */
if (temp1 == (i*0x00345678))
size = i;
else
break;
}
/* Ok, we're satisfied we've got 32MB, let's test the second lot */
if ((size + 1) == i) {
for(i=0;i<32;i++) {
/* Clear first 32MB */
MMIO_OUT32(pGlint->FbBase, i*1024*1024, 0);
}
mem_barrier();
for(i=32;i<64;i++) {
/* write test pattern */
MMIO_OUT32(pGlint->FbBase, i*1024*1024, i*0x00345678);
mem_barrier();
temp1 = MMIO_IN32(pGlint->FbBase, i*1024*1024);
temp2 = MMIO_IN32(pGlint->FbBase, (i-32)*1024*1024);
/* Let's check for wrapover */
if ( (temp1 == (i*0x00345678)) && (temp2 == 0) )
size = i;
else
break;
}
}
GLINT_SLOW_WRITE_REG(temp, PM3MemBypassWriteMask);
#ifndef XSERVER_LIBPCIACCESS
xf86UnMapVidMem(pScrn->scrnIndex, (pointer)pGlint->FbBase,
pGlint->FbMapSize);
#else
pci_device_unmap_range(pGlint->PciInfo, pGlint->FbBase, pGlint->FbMapSize);
#endif
pGlint->FbBase = NULL;
pGlint->FbMapSize = 0;
return ( (size+1) * 1024 );
}
int
readDense32(pointer Base, register unsigned long Offset)
{
mem_barrier();
return *(volatile CARD32*)((unsigned long)Base+(Offset));
}
static int
readSparse32(pointer Base, register unsigned long Offset)
{
mem_barrier();
return *(vuip)((unsigned long)Base+(Offset));
}
